Protector for bearing for high speed spindles



Feb. 28, 1933. c. T. RAULE 1,899,164

PROTECTOR FOR BEARING FOR HIGH SPEED SPINDLES Filed May 3, 1926 fication and in the claims.

Patented F eb. 28,

UNITED STATES;

CLIFFORD '1. RAULE, F 'BROOKLINE, PENNSYLVANIA PROTECTOR FOR BEARING FOR HIGH SPEED SPINDLES 1 Application filed na aisas. Serial No, 106,376.

My invention relates to the protection of high speed bearings of grindingmechanism and the like from abrasive dust or fine chips. A purpose of my invention is to automatically apply an outwardly directed blast of air close to the bearing to shield it from water,

dust or other foreign matter.

A further purpose is to mount an annularly' cupped disk upon a high speed spindle ad jacent the spindle bearing, perforating the disk near its circumference to adapt it to maintain a blast of air diagonally outward across the end of the bearing.

Further purposes will appear in the speci- I have preferred to illustrate my invention by one main form only with two minor modifications selecting for the illustration a form which is practical, efficient and inexpensive g and which at the same time wellillustrates the principles involved.

Figure 1 is a fragmentary side elevation partly broken away in section showing the preferred form: of my invention. 5 Figure 2 is a front elevation of the guard .shown in Figure 1.

' Figure 3 is a sectionof Figure 2 taken upon line 3-3. I i

. Figure 4 is a side elevation of the structure seen in Figure 3.

Fi ures, 5 and modified forms.

In thedrawing similar, numerals indicatelike parts. s e s I The danger from foreign matter entering the bearings of rotating tools, present in all cases where fine chips and dust areithrown, is much more marked andseriouswith grinding machines than with most other types of machine because of the fineness and quantity of the dust thrown and its abrasive action upon the bearings when it does enter them.

For this reason I have illustrated my invention as applied to an internal grinder though '45 I recognize its applicability to other rotating tools also. I In Figure 1, I port 6 within which is mounted a hollowbearing 7 held in placeby anexternally threaded sleeve the shaft 1f) complete the illustration of s intendedto be typical of any bearing'ne'eding protection from dust, dirt, chips or other 'ternal grinder 13. I

As is well known these abrasive tools in, of grinding and successive hang; gradually settle into unprotected-bearings as the air to force .6 arefront elevations of cent to the bearing.

have shown a bearing sup-v 8." Suitable oilj holes shown at 9 and I what foreign matter. The shaft is rotated by M1) suitable pulley and belt or othermeans not shown.

At its outer end the shaft 10 is shown supporting a chuck 11, whosejaw's 12hold a'n'innormal operation truing up throw offabrasive dust which may I for a time suspended in the air,- to

'wellas to the floor.

I protect the bearings by an-annula'r cupguard lhWhICh is fastened to the shaft at the end of the bearing so as torotate with the shaft.

In :the preferred form the annular cup is apertured as at 15 radially beyond the bearing insuch a direction that rotation of the shaft causes flow ofair'through the apertures from the side toward the. grinding toolto the side toward the bearing. I p

This can be accomplished in a variety of ways of which I have illustrated one by centrifugal action,

bination of centrifugal and scooping action.

one by catching or scooping. itthrough and one by a com- In Figuresl I have shown centrifugal,

catch the air and cause it to be driven through the openings toward the bearing.

In Figure 6 I illustrate that the centrifugal and. the scooping formsm'ay be combined,

the openings scooping that they slope tothe air into the pas 1 as I sages through the guard leading diagonally outward.

For simplicity I mount the guard upon the shaft by means of an integral collar 18 I I claim as new and desire Patent 1s upon the interior of the guard and formran annular space for the air to be fed between it and the outer flange or shell 19 which is also integral with the guard.

In View of my invention and disclosure variations and modifications to meet individual whim or particular need to obtain part or all of the benefit of my invention without copying the structure of the drawing will doubtless become evident to others skilled in the art and I therefore claim all such in so far as they fall within the reasonable spirit and scope of myinvention.

Having thus described my lnvention what to secure by Letters 1. In a guard for a shaft-bearing, an annular cup having diagonally outward perforations near its outer circumference, mounted on the shaft adjacent the bearing and facing away therefrom.

2." In a guard for the bearing ofa high- I speed shaft, an annular cup mounted on the i the bearing and having shaft adjacent the bearing, facing away from diagonally outward perforations directed diagonally past the end of the bearing.

3. In a guard for a shaft bearing, an annular cup rotatable with the movable part of the bearing, located close to the fixed part of the bearings and having a diagonally outwardly extending opening directed across the annular opening into the space between.

the cup and fixed part of,

the bearing and adapted to cause air to flow from beyond the cup across the said space when the cup is rotated. v

CLIFFORD T; RAULE. 

